8/18/2019 Unreliable Speed

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PFPF   PNFPNFCommon LR

UNRELIABLE SPEED INDICATION

LR - Version 01e

 IAS Fluctuations

 Flight parameters abnormal correlation

  Abnormal AP/FD/ATHR behavior 

 Undue stall warning or overspeed warning

 When indicated speed aerodynamic noise

 When indicated speed aerodynamic noise

Suspect unreliable

speed indication

WrongWrong AP / FD

WrongOKFPV

WrongOKV/S

WrongOK ALT

WrongWrongIndicated speed / Mach

static Pitot Failure

Probes schematic 

8/18/2019 Unreliable Speed

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PFPF   PNFPNFCommon LR

1. PITOT PROBES BLOCKED

FLIGHT IS FROZEN TO PERMIT THE PROCEDURE APPLICATION ON THE M/FTD

DETECTION 

FLIES THE AIRCRAFT

NAVIGATES

CONSIDER AUTOMATION USE 

ECAM ACTIONS 

DECISION 

ECAM PROCEDURE 

SYSTEM DISPLAY 

STATUS 

RETURN TO NORMAL TASK SHARING 

LD G D I S TLDG DI

ST

WEATHER

WEATHER

OPERATIONAL AND

COMMERCIAL

CONSIDERATIONS

O

PERATIONAL AND

COMMERCIALCONSIDERATIONS

NOTIFYNO

TIFY

DECISIONDECISION

OPS …OPS …

PURSER /PAXPURSER /P

AX

ATC

ATC

STATUS,or 

SUMMARY

PF

COMMUNICATES

Check IAS indications

All indications may be consistent 

BUT equally unreliable!

ALT

V/S

FPV

Remain correct 

in this case

A330 / A340-600 :   A340-300 :

8/18/2019 Unreliable Speed

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PFPF   PNFPNFCommon LR

PROBES SCHEMATIC

ADR 1   ADR 3 ADR 2

Normal display

Reconfigurations

CAPT

probes

STBY

probes

F/O

probes

PFD 1   PFD 2

8/18/2019 Unreliable Speed

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PFPF   PNFPNFCommon LR

1. PITOT PROBES BLOCKED

FLIGHT IS FROZEN TO PERMIT THE PROCEDURE APPLICATION ON THE M/FTD

DETECTION 

FLIES THE AIRCRAFT

NAVIGATES

CONSIDER AUTOMATION USE 

ECAM ACTIONS 

DECISION 

ECAM PROCEDURE 

SYSTEM DISPLAY 

STATUS 

RETURN TO NORMAL TASK SHARING 

LD G D I S TLDG DI

ST

WEATHER

WEATHER

OPERATIONAL AND

COMMERCIAL

CONSIDERATIONS

O

PERATIONAL AND

COMMERCIALCONSIDERATIONS

NOTIFYNO

TIFY

DECISIONDECISION

OPS …OPS …

PURSER /PAXPURSER /P

AX

ATC

ATC

STATUS,or 

SUMMARY

PF

COMMUNICATES

Check the 3 airspeed indications

All indications may be consistent 

BUT equally unreliable!

ADR 1

ADR 3

ADR 2

SPEED > VFEFWC

SPEED > VFE OR

SPEED > VFE

At least one ADR speed > VFE or VMO/MMO   OVERSPEED warning

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PFPF   PNFPNF A330/A340-600

UNRELIABLE SPEED INDICATION

MEMORY ITEMSBelow THR RED ALT:  TOGA/15°

THRUST/PITCH…………………   Above THR RED ALT:  CL/10° Below FL 100

CL/5° Above FL 100

AP………………………………………………….OFF

FD………………………………………………….OFF

A/THR……………………………………………..OFF

FLAPS……………MAINTAIN CURRENT CONFIG

SPEEDBRAKES……………CHECK RETRACTED

L/G…………………………….UP WHEN AIRBONE

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PFPF   PNFPNF A340-300

UNRELIABLE SPEED INDICATION

MEMORY ITEMSBelow THR RED ALT:  TOGA/12.5°

THRUST/PITCH…………………   Above THR RED ALT:  CL/10° Below FL 100

CL/5° Above FL 100

AP………………………………………………….OFF

FD………………………………………………….OFF

A/THR……………………………………………..OFF

FLAPS……………MAINTAIN CURRENT CONFIG

SPEEDBRAKES……………CHECK RETRACTED

L/G…………………………….UP WHEN AIRBONE

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PFPF   PNFPNFCommon LR Common LR

1. PITOT PROBES BLOCKED

FLIGHT IS FROZEN TO PERMIT THE PROCEDURE APPLICATION ON THE M/FTD

DETECTION 

FLIES THE AIRCRAFT

NAVIGATES

CONSIDER AUTOMATION USE 

ECAM ACTIONS 

DECISION 

ECAM PROCEDURE 

SYSTEM DISPLAY 

STATUS 

RETURN TO NORMAL TASK SHARING 

LD G D I S TLDG DI

ST

WEATHER

WEATHER

OPERATIONAL AND

COMMERCIAL

CONSIDERATIONS

O

PERATIONAL AND

COMMERCIALCONSIDERATIONS

NOTIFYNO

TIFY

DECISIONDECISION

OPS …OPS …

PURSER /PAXPURSER /P

AX

ATC

ATC

STATUS,or 

SUMMARY

PF

COMMUNICATES

Check IAS indications

All indications may be consistent 

BUT equally unreliable!

ALT

V/S

FPV

Remain correct 

in this case

A330 / A340-600 :   A340-300 :

QRH

2.00

 ADR check proc 

&

Unreliable speed 

indication

Revert to pitch / thrust setting

references

Any doubt regarding speed indication

8/18/2019 Unreliable Speed

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PFPF   PNFPNFCommon LR1. PITOT PROBES BLOCKED

FLIGHT IS FROZEN TO PERMIT THE PROCEDURE APPLICATION ON THE M/FTD

DETECTION 

FLIES THE AIRCRAFT

NAVIGATES

CONSIDER AUTOMATION USE 

ECAM ACTIONS 

DECISION 

ECAM PROCEDURE 

SYSTEM DISPLAY 

STATUS 

RETURN TO NORMAL TASK SHARING 

LD G D I S TLDG DIST

WEATHERWEATHER

OPERATIONAL AND

COMMERCIAL

CONSIDERATIONS

OPERATIONAL AND

COMMERCIALCONSIDERATIONS

NOTIFYNOTIFY

DECISIONDECISION

OPS …OPS …

PURSER /PAXPURSER /PAX

ATCATC

STATUS,or 

SUMMARY

PF

COMMUNICATES

Check IAS indications

All indications may be consistent 

BUT equally unreliable!

ALT

V/S

FPV

Remain correct 

in this caseALT

GSAvailable on GPS

A330 / A340-600 :   A340-300 :